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25 //
26 //
27 // -------------------------------------------
28 //
29 // GEANT4 Class header file
30 //
31 // File name: G4GoudsmitSaundersonTable
32 //
33 // Author: Mihaly Novak / (Omrane Kadri
34 //
35 // Creation date: 20.02.2009
36 //
37 // Class description:
38 // Class to handle multiple scattering angul
39 // using Kawrakow-Bielajew Goudsmit-Saunders
40 // Rutherford DCS for elastic scattering of
41 // class is used by G4GoudsmitSaundersonMscM
42 // deflection of electrons/positrons after t
43 //
44 // Modifications:
45 // 04.03.2009 V.Ivanchenko cleanup and format
46 // 18.05.2015 M. Novak This class has been com
47 // class name was kept; class descr
48 // A new version of Kawrakow-Bielaj
49 // based on the screened Rutherford
50 // electrons/positrons has been int
51 // angular distributions over a 2D
52 // and the CDFs are now stored in a
53 // together with the corresponding
54 // The new version is several times
55 // compared to the earlier version
56 // that use these data has been als
57 // 28.04.2017 M. Novak: the GS angular distrib
58 // data size has been reduced from
59 // representation, the class has be
60 // this new data representation.
61 // 23.08.2017 M. Novak: Added funtionality to
62 // base GS angular distributions an
63 // parameter, first and second mome
64 // activated in the GS-MSC model.
65 //
66 // References:
67 // [1] A.F.Bielajew, NIMB, 111 (1996) 195-20
68 // [2] I.Kawrakow, A.F.Bielajew, NIMB 134(19
69 //
70 // -------------------------------------------
71
72
73 #ifndef G4GoudsmitSaundersonTable_h
74 #define G4GoudsmitSaundersonTable_h 1
75
76 #include <vector>
77
78 #include "G4Types.hh"
79
80 class G4GSMottCorrection;
81 class G4MaterialCutsCouple;
82
83 class G4GoudsmitSaundersonTable {
84
85 public:
86 G4GoudsmitSaundersonTable(G4bool iselectron)
87 ~G4GoudsmitSaundersonTable();
88
89 void Initialise(G4double lownergylimit, G4do
90
91 // structure to store one GS transformed ang
92 struct GSMSCAngularDtr {
93 G4int fNumData; // # of data points
94 G4double *fUValues; // array of transfo
95 G4double *fParamA; // array of interpo
96 G4double *fParamB; // array of interpo
97 };
98
99 void LoadMSCData();
100
101 G4bool Sampling(G4double lambdaval, G4doub
102 G4double &cost, G4doub
103 G4double beta2, G4int
104 G4int &mcekini, G4int &mcd
105 G4bool isfirst);
106
107 G4double SampleCosTheta(G4double lambdaval,
108 G4double lekin,
109 GSMSCAngularDtr **gs
110 G4double &transfPar,
111
112 G4double SampleGSSRCosTheta(const GSMSCAngul
113
114 G4double SingleScattering(G4double lambdaval
115 G4double beta2, G4
116
117 GSMSCAngularDtr* GetGSAngularDtr(G4double sc
118 G4double &q
119
120 // material dependent MSC parameters (comput
121 // Moliere's screening parameter
122 G4double GetMoliereBc(G4int matindx) { retu
123
124 G4double GetMoliereXc2(G4int matindx) { retu
125
126 void GetMottCorrectionFactors(G4double l
127 G4int mati
128 G4double &
129
130 // set option to activate/inactivate Mott-co
131 void SetOptionMottCorrection(G4bool val)
132 // set option to activate/inactivate PWA-cor
133 void SetOptionPWACorrection(G4bool val)
134
135 // this method returns with the scattering p
136 // interpolated from tables prepared at init
137 G4double ComputeScatteringPowerCorrection(co
138
139 void InitSCPCorrection();
140
141 private:
142 // initialisation of material dependent Moli
143 void InitMoliereMSCParams();
144
145
146 private:
147 static G4bool gIsInitialised;
148 static constexpr G4int gLAMBNUM = 64;
149 static constexpr G4int gQNUM1 = 15;
150 static constexpr G4int gQNUM2 = 32;
151 static constexpr G4int gNUMSCR1 = 201;
152 static constexpr G4int gNUMSCR2 = 51;
153 static constexpr G4double gLAMBMIN = 1.0;
154 static constexpr G4double gLAMBMAX = 100000
155 static constexpr G4double gQMIN1 = 0.001;
156 static constexpr G4double gQMAX1 = 0.99;
157 static constexpr G4double gQMIN2 = 0.99;
158 static constexpr G4double gQMAX2 = 7.99;
159 //
160 G4bool fIsElectron; // GS-table
161 G4bool fIsMottCorrection; // flag to i
162 G4bool fIsPWACorrection; // flag to i
163 G4double fLogLambda0; // ln(gLAMBM
164 G4double fLogDeltaLambda; // ln(gLAMBM
165 G4double fInvLogDeltaLambda; // 1/[ln(gLA
166 G4double fInvDeltaQ1; // 1/[(gQMAX
167 G4double fDeltaQ2; // [(gQMAX2-
168 G4double fInvDeltaQ2; // 1/[(gQMAX
169 //
170 G4double fLowEnergyLimit;
171 G4double fHighEnergyLimit;
172 //
173 int fNumSPCEbinPerDec; // scatterin
174 struct SCPCorrection {
175 bool fIsUse; //
176 double fPrCut; // sec. e- p
177 double fLEmin; // log min e
178 double fILDel; // inverse l
179 //std::vector<double> fVEkin; // scatter
180 std::vector<double> fVSCPC; // scatterin
181 };
182 std::vector<SCPCorrection*> fSCPCPerMatCut
183
184
185 // vector to store all GS transformed angul
186 static std::vector<GSMSCAngularDtr*> gGSMSC
187 static std::vector<GSMSCAngularDtr*> gGSMSC
188
189 //@{
190 /** Precomputed \f$ b_lambda_{c} $\f and \f
191 * Moliere parameters that can be used to
192 * the elastic scattering cross section (o
193 * screened Rutherford cross section appro
194 * G4GoudsmitSaundersonMscModel if fgIsUse
195 */
196 static std::vector<double> gMoliereBc;
197 static std::vector<double> gMoliereXc2;
198 //
199 //
200 G4GSMottCorrection *fMottCorrection;
201 };
202
203 #endif
204